Sodium bicarbonate supplementation improves severe-intensity intermittent exercise under moderate acute hypoxic conditions.

Deb, Sanjoy K and Gough, Lewis A and Sparks, S Andy and McNaughton, Lars R (2018) Sodium bicarbonate supplementation improves severe-intensity intermittent exercise under moderate acute hypoxic conditions. European Journal of Applied Physiology, 118 (3). pp. 607-615. ISSN 1439-6327

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Acute moderate hypoxic exposure can substantially impair exercise performance, which occurs with a concurrent exacerbated rise in hydrogen cation (H) production. The purpose of this study was therefore, to alleviate this acidic stress through sodium bicarbonate (NaHCO) supplementation and determine the corresponding effects on severe-intensity intermittent exercise performance. Eleven recreationally active individuals participated in this randomised, double-blind, crossover study performed under acute normobaric hypoxic conditions (FiO% = 14.5%). Pre-experimental trials involved the determination of time to attain peak bicarbonate anion concentrations ([HCO]) following NaHCO ingestion. The intermittent exercise tests involved repeated 60-s work in their severe-intensity domain and 30-s recovery at 20 W to exhaustion. Participants ingested either 0.3 g kg bm of NaHCO or a matched placebo of 0.21 g kg bm of sodium chloride prior to exercise. Exercise tolerance (+ 110.9 ± 100.6 s; 95% CI 43.3-178 s; g = 1.0) and work performed in the severe-intensity domain (+ 5.8 ± 6.6 kJ; 95% CI 1.3-9.9 kJ; g = 0.8) were enhanced with NaHCO supplementation. Furthermore, a larger post-exercise blood lactate concentration was reported in the experimental group (+ 4 ± 2.4 mmol l; 95% CI 2.2-5.9; g = 1.8), while blood [HCO] and pH remained elevated in the NaHCO condition throughout experimentation. In conclusion, this study reported a positive effect of NaHCO under acute moderate hypoxic conditions during intermittent exercise and therefore, may offer an ergogenic strategy to mitigate hypoxic induced declines in exercise performance.

Item Type: Article
Identification Number:
Date: 17 January 2018
Subjects: A300 Clinical Medicine
B100 Anatomy, Physiology and Pathology
B400 Nutrition
C600 Sports Science
F100 Chemistry
Divisions: Faculty of Health, Education and Life Sciences > School of Health Sciences
REF UoA Output Collections > REF2021 UoA24: Sport and Exercise Sciences, Leisure and Tourism
Depositing User: Lewis Gough
Date Deposited: 24 May 2018 10:16
Last Modified: 24 May 2018 10:16

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